Zebra mussel

Md. Boaters Asked To Help Stop Zebra Mussels SpreadMaryland Natural Resources officials are asking boaters to help stop the spread of invasive zebra mussels.
Aquatic Disruption: Zebra Mussels Spotted In Chesapeake BayAn aquatic hitchhiker, which caused millions in damage, is being spotted in Maryland in the upper Chesapeake Bay.